2,3,22,23-tetra-O-acetylcastasterone

(1R,3aS,3bS,5aS,6aS,9aR,10aR,10bS,12aS)-1-((S)-1-((4R,5R)-2,2-dimethyl-5-((S)-3-methylbutan-2-yl)-1,3-dioxolan-4-yl)ethyl)-8,8,10a,12a-tetramethylhexadecahydro-5H-cyclopenta[7,8]phenanthro[2,3-d][1,3]dioxol-5-one